GENERAL DESCRIPTION

The XRT91L82 is a fully integrated SONET/SDH transceiver for OC-48/STM16 applications supporting the use of Forward Error Correction (FEC) capability. The transceiver includes an on-chip Clock Multiplier Unit (CMU), which uses a high frequency PhaseLocked Loop (PLL) to generate the high-speed transmit serial clock from slower external clock references. It also provides Clock and Data Recovery (CDR) functions by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial data stream.

FEATURES

? 2.488 / 2.666 Gbps Transceiver

? Targeted for SONET OC-48/SDH STM-16 Applications

? Selectable full duplex operation between standard rate of 2.488 Gbps or Forward Error Correction rate of 2.666 Gbps

? Single-chip fully integrated solution containing parallel-to-serial converter, clock multiplier unit (CMU), serialto-parallel converter, and clock data recovery (CDR) functions

? 16-bit Differential LVDS/LVPECL, or Single-Ended LVPECL signaling data paths running at 155.52/166.63 Mbps using internal input termination for reduced passive components on board

? Non-FEC and FEC rate REF1CLKP/N and REF2CLKP/N dual reference input ports

? Supports 155.52/166.63MHz or 77.76/83.31MHz transmit and receive external reference input ports

? Optional VCXO input port support multiple de-jittering modes in Host mode

? On-chip phase detector and charge pump for external VCXO based de-jittering PLL

? Internal FIFO decouples transmit parallel clock input and transmit parallel clock output

? Provides Local, Remote Serial and Remote Parallel Loopback modes as well as Loop Timing mode

? Diagnostics features include various lock detect functions and transmit CMU and receive CDR Lock Detect

? Host mode serial microprocessor interface simplifies monitor and control

? Meets Telcordia, ANSI and ITU-T jitter requirements including T1.105.03 - 2002 SONET Jitter Tolerance specification, GR-253 CORE, GR-253-ILR- SONET Jitter specifications.

? Operates at 1.8V CMOS and CML Power with 3.3V I/O

? 500mW Typical Power Dissipation using LVDS Interface

? Package: 15 x 15 mm 196-pin STBGA

? IEEE 1149.1 Compatable JTAG port

APPLICATIONS

? SONET/SDH-based Transmission Systems

? Add/Drop Multiplexers

? Cross Connect Equipment

? ATM and Multi-Service Switches, Routers and Switch/Routers

? DSLAMS

? SONET/SDH Test Equipment

? DWDM Termination Equipment